When David Miliband spoke at the Cambridge Union last week, was he espousing a new, more creative foreign policy or did he simply wish to defend the Bush-Blair approach of the preceding decade? David Miliband has become something of a peripatetic political being. For large parts of the parliamentary year he simply disappears and people begin to ask the ‘what’s he up to now?’ question they asked of Gordon Brown. But suddenly, almost ex nihilo, he appears again and begins a flurry of speaking engagements, interviews and articles all to do, supposedly, with a political cause he has aligned himself to. The cause that prompted him to speak at the Cambridge Union and at other universities, for example, was the …